Geotding-mill



'UNITED sTATEs PATENT oEEIoE.

SAMUEL MOORE, OF WELLSBURG, VIRGINIA.

GRINDING-MILL.

Specication of Letters Patent No. 28,681, dated June 12, 1860.

To all whom it may concern:

Be it known that I, SAMUEL MOORE, of lVellsburg, in the county of Brooke and State of Virginia, have invented certain new and useful Improvements in Grinding- Mills; and I do hereby declare that the following is a full, clear, and eXact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l is a vertical central section of a pair of mill stones with my improvements applied to them. Fig. 2 is an in verted plan of the upper stone or runner. Fig. 3 is a detached plan or top view of the bail or balance iron. Fig. 4 is a detached plan or top view of the driver. Fig. 5 is a plan or top view of the curb.

Similar letters of reference indicate corresponding parts in the several figures.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A represents the bed stone, and B, the upper stone or runner, the above constituting a pair of mill-stones.

C is the spindle which passes through the bush D, at the center of the bed-stone A, and is secured therein in a proper vertical position by any of the means usually employed for such purpose.

On the upper end of the spindle O, the driver E, is fitted, the driver turning with the spindle. This driver is formed of a circular plate having three or more notches or recesses a, made at equal distances apart in its edge. Four notches or recesses are shown in the driver in Fig. 4t, but more or less may be used; four however would probably be the preferable number. The upper end of the spindle has a recess b, made in it, the object of which will be presently shown.

F is the bail or balance iron, which may be described as being formed of the frustum of a cone c, with four horns (l, attached and projecting laterally and radially from it. The number of horns cl, must correspond with the number of notches or recesses a., in the driver E, and the horns (Z, are of such shape that their inner edges will fit into the notches or recesses a, of the driver,

part of the eye f. The bell-shaped portion g,

of the tube and the side of the eye are slotted at four points, equi-distant from each other to receive the outer edges of the horns d, of the driver.

The runner B, is supported by the rod c, which has its bearing in the upper end of the spindle, and this bearing is about in line with the face of the bedstone. The bearings also of the horns fl, being about in line with the bearing point of rod e. By this arrangement the upper stone may be driven without that lateral wabbling movement so frequently given in consequence of the runner being suspended above the bearing surfaces of the driver. This eifect is sure to occur if the spindle be slightly out of line, or the parallelism of the two stones be not fully preserved. This difficulty is obviated by my invention, and the runner may be rapidly driven with `a steady true motion.

H is the curb which encompasses the runner B. This curb has a metal tube I, fitted centrally in it, the upper part L, of the tube being of bell-shape and the lower partz', of cylindrical form, the latter' part passing into the eye f, of the runner and within the tube G, as shown clearly in Fig. 1. The top of the curb is provided with two valves j, y'.

Then the runner B, is in operation a vacuum is produced between the stones, and the air will rush down the tubes I, G, and between the stones, the tubes I, G, serving to cut off communication between the eye f, and the space between the top of the runner and the curb, thereby causing a suficient draft to pass between the stones. Should this draft be too strong at any time it may be diminished in strength by opening the valves j, y', which will cause a current of air to pass into the space between the curb and runner, and into the discharge spout, thereby decreasing the draft through the eye.

spindle Will be on a horizontal line or plane With the connecting points between the 10 driver E, and bail F, all as set forth.

SAMUEL MOORE.

Witnesses:

JAMES WAUGH, Jr., OBED E. GREEN. 

